Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Iran releases ten US Navy sailors after holding them overnight

Iran has released 10 US sailors after holding them overnight, bringing a swift end to an incident that had rattled nerves days ahead of the expected implementation of a landmark nuclear accord between Tehran and world powers.

Iran's Islamic Revolutionary Guard Corps (IRGC) said it had freed the sailors after determining they had entered Iranian territorial waters by mistake. The sailors had been detained aboard two US Navy patrol boats in the Gulf on Tuesday.

"Our technical investigations showed the two US Navy boats entered Iranian territorial waters inadvertently," the IRGC said in a statement carried by state television. "They were released in international waters after they apologised," it added.

Confirming the sailors' safe release, the Pentagon said there were no indications they were harmed while in Iranian custody.

A carefully worded statement did not explain how the sailors and their two riverine command boats ended up being detained by Iran, saying only that "the Navy will investigate the circumstances that led to the sailors' presence in Iran".

The sailors were later taken ashore by US Navy aircraft, while other sailors took charge of the boats and headed towards Bahrain, their original destination.

IRGC Rear Admiral Ali Fadavi had earlier said that the two US Navy boats entered Iranian territorial waters due to a broken navigation system.

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The incident raised tensions between Iran and the United States, which, along with other world powers, reached a deal last year under which Iran will curb its nuclear activities in exchange for the lifting of economic sanctions.

Some conservatives in both countries, enemies since Iran's 1979 Islamic revolution, have criticised the deal that is due to be implemented in the coming days.

Iran's armed forces chief, Major General Hassan Firouzabadi, said the incident should demonstrate Iranian strength to "troublemakers" in the US Congress, which has sought to put pressure on Iran after the nuclear deal.

And at a presidential campaign rally in the United States, Republican frontrunner Donald Trump, who accuses President Barack Obama of being weak on foreign policy, described the incident as "an indication of where the hell we're going".

Attributing the boats' incursion into Iranian waters to a navigation error marked a de-escalation in rhetoric. Earlier, the Guards had said the boats were "snooping" in Iranian territory and said Foreign Minister Mohammad Javad Zarif had demanded an apology from Washington.